Insulating paper



Patented Nov. 15, 1932 UNITED STATES PATENT OFFICE LOUIS OI CHICAGO,

llo Drawing.

in any other suitable manner to the sur aces.

The present invention relates to the last form.

Insulating paper should have high heat insulating properties, i. e. an extremely low heat conductivity, should be able to withstand high temperatures and in general to withstand a large amount of heat, and should i be durable. I have discovered a heat insulating paper which has these properties to an 2 unusual extent.

Insulating paper made in accordance with my invention has a composition which comprises generally slag wool. asbestos fibre and a'binder.

The slag wool (mineral fibre or silica fibre) is obtained in a well-knownmanner by blowing a blast of saturated steam through a spray of molten mineral slag. I have discovered that slag wool obtained from lead 3 slag is particularly advantageous in that it possesses unusually high insulating and heat resisting properties. Any suitable binder capable of withstand- 'n hi h tem eratures may be used. Preferemplofi a colloidal ela suchas W ming or ontana clays.

vhile the invention is suscep 1 e of various changes, I prefer to employ the foregoing ingredients in substantially the, following 4 proportions by weight:

Per cent Slag wool fibre 80 Asbestos fibre, 15 Colloidal clay L 5 In making the paper, the fore oing ingredients are mixed together. Sn clent water is added to the mixture to form a slush. The

slush is then run through a regular paper makin machine in which the msulatln paper is collected in the form of a felt wit 'afiix'ed my signature.

INSULATING PAPER Application filed February 14, 1980; Serial llo. 428,488.

interlacing fibresiheld together by the clay binder. he amount of water used determines the thickness of'the resulting pa er. Thus, if a large amount of water is used, a relativel thin paper is obtained, and con- Versely if less water is used, the paper is proportionately thicker.

The resulting insulating paper has high heat insulation and resisting properties, and

is efiicient over a long period of time. It 69 also has considerable strength. In the appended claims, it is to be understood that I employ the term paper to cover insulating board as well ,as paper. .The paper may be. used in its natural form, or may be rolled mto cylinder form to provide -pipe covering, or may be utilized in making various other insulating products. I claim as my mvention 1. A heat insulating paper" comprisin interlaced slag wool and asbestos fibres, an

a binder.

2. A heat insulating Slag wool fibre, asbestos clay. I i

3. A heatinsulating paper comprising slag wool fibre obtained from lead slag, asbestos fibre and clay.

4. A heat insulating paper comprising the following ingredients 1n substantially the following proportions by weight:

aper comprising bre, and colloidal r Percent Slag wool fibre; Asbestos fibre u 15 Binder 5 5. A heat insulating paper comprising the following ingredients in substantially the following proportions by weight:

. Percent Slag wool fibre obtained from lead slag' '80 Asbestos fibre 15 Colloidal clay 5 p 5 LOUIS WEBER.

In testimony whereof, I have hereunto A 

